Pension and Other Postretirement Benefits - Additional Information (Detail) - U.S. [Member] - Defined Benefit Pension Plan [Member]	Mar. 23, 2018
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Effective date qualified defined benefit pension plan will be frozen	Jun. 01, 2018
Employer non-elective contributions, percentage of employee compensation	3.00%

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration